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          leetCode简单题Day2
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        <p>leetcode几道简单题</p>
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<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/*1021.删除最外层的括号</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">有效括号字符串为空 ("")、"(" + A + ")" 或 A + B，其中 A 和 B 都是有效的括号字符串，+ 代表字符串的连接。例如，""，"()"，"(())()" 和 "(()(()))" 都是有效的括号字符串。</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">如果有效字符串 S 非空，且不存在将其拆分为 S = A+B 的方法，我们称其为原语（primitive），其中 A 和 B 都是非空有效括号字符串。</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">给出一个非空有效字符串 S，考虑将其进行原语化分解，使得：S = P_1 + P_2 + ... + P_k，其中 P_i 是有效括号字符串原语。</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">对 S 进行原语化分解，删除分解中每个原语字符串的最外层括号，返回 S 。</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">示例 1：</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">输入："(()())(())"</span></span><br><span class="line"><span class="comment">输出："()()()"</span></span><br><span class="line"><span class="comment">解释：</span></span><br><span class="line"><span class="comment">输入字符串为 "(()())(())"，原语化分解得到 "(()())" + "(())"，</span></span><br><span class="line"><span class="comment">删除每个部分中的最外层括号后得到 "()()" + "()" = "()()()"。</span></span><br><span class="line"><span class="comment">示例 2：</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">输入："(()())(())(()(()))"</span></span><br><span class="line"><span class="comment">输出："()()()()(())"</span></span><br><span class="line"><span class="comment">解释：</span></span><br><span class="line"><span class="comment">输入字符串为 "(()())(())(()(()))"，原语化分解得到 "(()())" + "(())" + "(()(()))"，</span></span><br><span class="line"><span class="comment">删除每个部分中的最外层括号后得到 "()()" + "()" + "()(())" = "()()()()(())"。</span></span><br><span class="line"><span class="comment">示例 3：</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">输入："()()"</span></span><br><span class="line"><span class="comment">输出：""</span></span><br><span class="line"><span class="comment">解释：</span></span><br><span class="line"><span class="comment">输入字符串为 "()()"，原语化分解得到 "()" + "()"，</span></span><br><span class="line"><span class="comment">删除每个部分中的最外层括号后得到 "" + "" = ""。</span></span><br><span class="line"><span class="comment">*/</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">_1021_</span>删除最外层括号 </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">        String str = <span class="string">"(()()()(()()))(())"</span>;</span><br><span class="line">        System.out.println(solution2(str));</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> String <span class="title">solution1</span><span class="params">(String s)</span> </span>&#123;</span><br><span class="line">        StringBuilder sb = <span class="keyword">new</span> StringBuilder();</span><br><span class="line">        <span class="keyword">int</span> level = <span class="number">0</span>;</span><br><span class="line">        <span class="keyword">for</span> (<span class="keyword">char</span> c : s.toCharArray()) &#123;</span><br><span class="line">            <span class="keyword">if</span> (c == <span class="string">')'</span>) level--;</span><br><span class="line">            <span class="keyword">if</span> (level &gt;= <span class="number">1</span>) sb.append(c);</span><br><span class="line">            <span class="keyword">if</span> (c == <span class="string">'('</span>) level++;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> sb.toString();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> String <span class="title">solution2</span><span class="params">(String S)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">int</span> begin = <span class="number">0</span>, end = <span class="number">0</span>;</span><br><span class="line">        StringBuilder sb = <span class="keyword">new</span> StringBuilder();</span><br><span class="line">        Stack&lt;Character&gt; stack = <span class="keyword">new</span> Stack&lt;Character&gt;();</span><br><span class="line">        <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i &lt; S.length(); i++) &#123;</span><br><span class="line">            <span class="keyword">char</span> ch = S.charAt(i);</span><br><span class="line">            <span class="keyword">if</span> (ch == <span class="string">'('</span>)</span><br><span class="line">                stack.push(ch);</span><br><span class="line">            <span class="keyword">else</span> &#123;</span><br><span class="line">                stack.pop();</span><br><span class="line">                <span class="keyword">if</span> (stack.isEmpty()) &#123;</span><br><span class="line">                    end = i;</span><br><span class="line">                    sb.append(S.substring(begin + <span class="number">1</span>,end));</span><br><span class="line">                    begin = i + <span class="number">1</span>;</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> sb.toString();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/*面试03.04	化栈为队</span></span><br><span class="line"><span class="comment">实现一个MyQueue类，该类用两个栈来实现一个队列。</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">示例：</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">MyQueue queue = new MyQueue();</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">queue.push(1);</span></span><br><span class="line"><span class="comment">queue.push(2);</span></span><br><span class="line"><span class="comment">queue.peek();  // 返回 1</span></span><br><span class="line"><span class="comment">queue.pop();   // 返回 1</span></span><br><span class="line"><span class="comment">queue.empty(); // 返回 false</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">说明：</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">你只能使用标准的栈操作 -- 也就是只有 push to top, peek/pop from top, size 和 is empty 操作是合法的。</span></span><br><span class="line"><span class="comment">你所使用的语言也许不支持栈。你可以使用 list 或者 deque（双端队列）来模拟一个栈，只要是标准的栈操作即可。</span></span><br><span class="line"><span class="comment">假设所有操作都是有效的 （例如，一个空的队列不会调用 pop 或者 peek 操作）。</span></span><br><span class="line"><span class="comment">*/</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">_</span>面试03<span class="title">_04</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">        MyQueue queue = <span class="keyword">new</span> MyQueue();</span><br><span class="line">        queue.push(<span class="number">1</span>);</span><br><span class="line">        queue.push(<span class="number">2</span>);</span><br><span class="line">        System.out.println(queue.peek());</span><br><span class="line">        System.out.println(queue.pop());</span><br><span class="line">        System.out.println(queue.empty());</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">static</span> <span class="class"><span class="keyword">class</span> <span class="title">MyQueue</span> </span>&#123;</span><br><span class="line">        Stack&lt;Integer&gt; numStack;</span><br><span class="line">        Stack&lt;Integer&gt; helpStack;</span><br><span class="line"></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="title">MyQueue</span><span class="params">()</span> </span>&#123;</span><br><span class="line">            numStack = <span class="keyword">new</span> Stack&lt;Integer&gt;();</span><br><span class="line">            helpStack = <span class="keyword">new</span> Stack&lt;Integer&gt;();</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">push</span><span class="params">(<span class="keyword">int</span> x)</span> </span>&#123;</span><br><span class="line">            <span class="keyword">while</span> (!helpStack.isEmpty())&#123;</span><br><span class="line">                numStack.push(helpStack.pop());</span><br><span class="line">            &#125;</span><br><span class="line">            numStack.push(x);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">pop</span><span class="params">()</span> </span>&#123;</span><br><span class="line">            peek();</span><br><span class="line">            <span class="keyword">return</span> helpStack.pop();</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">peek</span><span class="params">()</span> </span>&#123;</span><br><span class="line">            <span class="keyword">if</span>(!numStack.isEmpty())</span><br><span class="line">                numStack.peek();</span><br><span class="line">            <span class="keyword">while</span> (!numStack.isEmpty())&#123;</span><br><span class="line">                helpStack.push(numStack.pop());</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="keyword">return</span> helpStack.peek();</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">empty</span><span class="params">()</span> </span>&#123;</span><br><span class="line">            <span class="keyword">return</span> numStack.isEmpty() &amp;&amp; helpStack.isEmpty();</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/*</span></span><br><span class="line"><span class="comment">1047.删除字符串中的所有相邻重复项</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">给出由小写字母组成的字符串 S，重复项删除操作会选择两个相邻且相同的字母，并删除它们。</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">在 S 上反复执行重复项删除操作，直到无法继续删除。</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">在完成所有重复项删除操作后返回最终的字符串。答案保证唯一。</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">示例：</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">输入："abbaca"</span></span><br><span class="line"><span class="comment">输出："ca"</span></span><br><span class="line"><span class="comment">解释：</span></span><br><span class="line"><span class="comment">例如，在 "abbaca" 中，我们可以删除 "bb" 由于两字母相邻且相同，这是此时唯一可以执行删除操作的重复项。之后我们得到字符串 "aaca"，其中又只有 "aa" 可以执行重复项删除操作，所以最后的字符串为 "ca"。</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">*/</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">_1047_</span>删除字符串中的所有相邻重复项 </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">        System.out.println(removeDuplicates(<span class="string">"abbaca"</span>));</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> String <span class="title">removeDuplicates</span><span class="params">(String S)</span> </span>&#123;</span><br><span class="line">        Stack&lt;Character&gt; stack = <span class="keyword">new</span> Stack&lt;Character&gt;();</span><br><span class="line"></span><br><span class="line">        <span class="keyword">for</span>(<span class="keyword">int</span> i = <span class="number">0</span>;i &lt; S.length();i++)&#123;</span><br><span class="line">            <span class="keyword">if</span>(stack.isEmpty() || stack.peek() != S.charAt(i))</span><br><span class="line">                stack.push(S.charAt(i));</span><br><span class="line">            <span class="keyword">else</span>&#123;</span><br><span class="line">                stack.pop();</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        StringBuilder sb = <span class="keyword">new</span> StringBuilder();</span><br><span class="line">        <span class="keyword">for</span>(<span class="keyword">char</span> c:stack)&#123;</span><br><span class="line">            sb.append(c);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> sb.toString();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/*</span></span><br><span class="line"><span class="comment">682.棒球比赛</span></span><br><span class="line"><span class="comment">你现在是棒球比赛记录员。</span></span><br><span class="line"><span class="comment">给定一个字符串列表，每个字符串可以是以下四种类型之一：</span></span><br><span class="line"><span class="comment">1.整数（一轮的得分）：直接表示您在本轮中获得的积分数。</span></span><br><span class="line"><span class="comment">2. "+"（一轮的得分）：表示本轮获得的得分是前两轮有效 回合得分的总和。</span></span><br><span class="line"><span class="comment">3. "D"（一轮的得分）：表示本轮获得的得分是前一轮有效 回合得分的两倍。</span></span><br><span class="line"><span class="comment">4. "C"（一个操作，这不是一个回合的分数）：表示您获得的最后一个有效 回合的分数是无效的，应该被移除。</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">每一轮的操作都是永久性的，可能会对前一轮和后一轮产生影响。</span></span><br><span class="line"><span class="comment">你需要返回你在所有回合中得分的总和。</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">示例 1:</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">输入: ["5","2","C","D","+"]</span></span><br><span class="line"><span class="comment">输出: 30</span></span><br><span class="line"><span class="comment">解释: </span></span><br><span class="line"><span class="comment">第1轮：你可以得到5分。总和是：5。</span></span><br><span class="line"><span class="comment">第2轮：你可以得到2分。总和是：7。</span></span><br><span class="line"><span class="comment">操作1：第2轮的数据无效。总和是：5。</span></span><br><span class="line"><span class="comment">第3轮：你可以得到10分（第2轮的数据已被删除）。总数是：15。</span></span><br><span class="line"><span class="comment">第4轮：你可以得到5 + 10 = 15分。总数是：30。</span></span><br><span class="line"><span class="comment">示例 2:</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">输入: ["5","-2","4","C","D","9","+","+"]</span></span><br><span class="line"><span class="comment">输出: 27</span></span><br><span class="line"><span class="comment">解释: </span></span><br><span class="line"><span class="comment">第1轮：你可以得到5分。总和是：5。</span></span><br><span class="line"><span class="comment">第2轮：你可以得到-2分。总数是：3。</span></span><br><span class="line"><span class="comment">第3轮：你可以得到4分。总和是：7。</span></span><br><span class="line"><span class="comment">操作1：第3轮的数据无效。总数是：3。</span></span><br><span class="line"><span class="comment">第4轮：你可以得到-4分（第三轮的数据已被删除）。总和是：-1。</span></span><br><span class="line"><span class="comment">第5轮：你可以得到9分。总数是：8。</span></span><br><span class="line"><span class="comment">第6轮：你可以得到-4 + 9 = 5分。总数是13。</span></span><br><span class="line"><span class="comment">第7轮：你可以得到9 + 5 = 14分。总数是27。</span></span><br><span class="line"><span class="comment">*/</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">_682_</span>棒球比赛 </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">        String[] s = &#123;<span class="string">"5"</span>,<span class="string">"2"</span>,<span class="string">"C"</span>,<span class="string">"D"</span>,<span class="string">"+"</span>&#125;;</span><br><span class="line">        System.out.println(calPoints(s));</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">int</span> <span class="title">calPoints</span><span class="params">(String[] ops)</span> </span>&#123;</span><br><span class="line">        Stack&lt;Integer&gt; scores = <span class="keyword">new</span> Stack&lt;Integer&gt;();</span><br><span class="line">        <span class="keyword">for</span>(<span class="keyword">int</span> i = <span class="number">0</span>;i &lt; ops.length;i++)&#123;</span><br><span class="line">            <span class="keyword">if</span> (ops[i].equals(<span class="string">"+"</span>))&#123;</span><br><span class="line">                <span class="keyword">int</span> temp1 = scores.pop();</span><br><span class="line">                <span class="keyword">int</span> temp2 = scores.peek();</span><br><span class="line">                scores.push(temp1);</span><br><span class="line">                scores.push(temp1 + temp2);</span><br><span class="line">            &#125;<span class="keyword">else</span> <span class="keyword">if</span> (ops[i].equals(<span class="string">"D"</span>))&#123;</span><br><span class="line">                <span class="keyword">int</span> temp = scores.peek();</span><br><span class="line">                scores.push(temp*<span class="number">2</span>);</span><br><span class="line">            &#125;<span class="keyword">else</span> <span class="keyword">if</span> (ops[i].equals(<span class="string">"C"</span>))&#123;</span><br><span class="line">                scores.pop();</span><br><span class="line">            &#125;<span class="keyword">else</span>&#123;</span><br><span class="line">                scores.push(Integer.parseInt(ops[i]));</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">int</span> sum = <span class="number">0</span>;</span><br><span class="line">        <span class="keyword">for</span>(<span class="keyword">int</span> a : scores)&#123;</span><br><span class="line">            sum+= a;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> sum;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>


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        <div style="text-align:center;color: #ccc;font-size:14px;">-------------本文结束<i class="fa fa-paw"></i>感谢您的阅读-------------</div>
    
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